Is the Galactic Centre gamma-ray source 1E1740.7 – 2942 accreting from a molecular cloud?

Nature ◽  
1991 ◽  
Vol 353 (6341) ◽  
pp. 234-237 ◽  
Author(s):  
John Bally ◽  
Marvin Leventhal
Keyword(s):  
Molecular Cloud ◽  
Gamma Ray ◽  
Galactic Centre

scholarly journals A new distance to the Brick, the dense molecular cloud G0.253+0.016

2021 ◽  
Vol 502 (1) ◽  
pp. 1246-1252
Author(s):  
M Zoccali ◽  
E Valenti ◽  
F Surot ◽  
O A Gonzalez ◽  
A Renzini ◽  
...  
Keyword(s):  
Star Formation ◽  
Molecular Cloud ◽  
Near Infrared ◽  
Formation Rate ◽  
Dynamical Evolution ◽  
Galactic Centre ◽  
The Galaxy ◽  
Centre Region ◽  
Order Of Magnitude ◽  
Red Clump

ABSTRACT We analyse the near-infrared colour–magnitude diagram of a field including the giant molecular cloud G0.253+0.016 (a.k.a. The Brick) observed at high spatial resolution, with HAWK-I@VLT. The distribution of red clump stars in a line of sight crossing the cloud, compared with that in a direction just beside it, and not crossing it, allow us to measure the distance of the cloud from the Sun to be 7.20, with a statistical uncertainty of ±0.16 and a systematic error of ±0.20 kpc. This is significantly closer than what is generally assumed, i.e. that the cloud belongs to the near side of the central molecular zone, at 60 pc from the Galactic centre. This assumption was based on dynamical models of the central molecular zone, observationally constrained uniquely by the radial velocity of this and other clouds. Determining the true position of the Brick cloud is relevant because this is the densest cloud of the Galaxy not showing any ongoing star formation. This puts the cloud off by one order of magnitude from the Kennicutt–Schmidt relation between the density of the dense gas and the star formation rate. Several explanations have been proposed for this absence of star formation, most of them based on the dynamical evolution of this and other clouds, within the Galactic centre region. Our result emphasizes the need to include constraints coming from stellar observations in the interpretation of our Galaxy’s central molecular zone.

scholarly journals CALIBRATING COLUMN DENSITY TRACERS WITH GAMMA-RAY OBSERVATIONS OF THEρOPHIUCHI MOLECULAR CLOUD

2017 ◽  
Vol 834 (1) ◽  
pp. 91 ◽  
Author(s):  
Ryan D. Abrahams ◽  
Alex Teachey ◽  
Timothy A. D. Paglione
Keyword(s):  
Molecular Cloud ◽  
Column Density ◽  
Gamma Ray

scholarly journals Disrupted globular clusters and the gamma-ray excess in the Galactic Centre

2018 ◽  
Vol 475 (4) ◽  
pp. 5313-5321 ◽  
Author(s):  
Giacomo Fragione ◽  
Fabio Antonini ◽  
Oleg Y Gnedin
Keyword(s):  
Globular Clusters ◽  
Gamma Ray ◽  
Galactic Centre

scholarly journals Jet interactions with a giant molecular cloud in the Galactic centre and ejection of hypervelocity stars

2012 ◽  
Vol 545 ◽  
pp. L11 ◽  
Author(s):  
J. Silk ◽  
V. Antonuccio-Delogu ◽  
Y. Dubois ◽  
V. Gaibler ◽  
M. R. Haas ◽  
...  
Keyword(s):  
Molecular Cloud ◽  
Galactic Centre ◽  
Giant Molecular Cloud ◽  
Jet Interactions

scholarly journals The Future of X-Ray Time-Domain Surveys

2011 ◽  
Vol 7 (S285) ◽  
pp. 199-206
Author(s):  
Daryl Haggard ◽  
Gregory R. Sivakoff
Keyword(s):  
Time Domain ◽  
Gamma Ray ◽  
High Energy ◽  
Galactic Centre ◽  
Time Resolved ◽  
X Ray ◽  
Stellar Flares ◽  
Time Domain Data ◽  
Deep Fields ◽  
Energy Dependent

AbstractModern X-ray observatories yield unique insight into the astrophysical time domain. Each X-ray photon can be assigned an arrival time, an energy and a sky position, yielding sensitive, energy-dependent light curves and enabling time-resolved spectra down to millisecond time-scales. Combining those with multiple views of the same patch of sky (e.g., in the Chandra and XMM-Newton deep fields) so as to extend variability studies over longer baselines, the spectral timing capacity of X-ray observatories then stretch over 10 orders of magnitude at spatial resolutions of arcseconds, and 13 orders of magnitude at spatial resolutions of a degree. A wealth of high-energy time-domain data already exists, and indicates variability on timescales ranging from microseconds to years in a wide variety of objects, including numerous classes of AGN, high-energy phenomena at the Galactic centre, Galactic and extra-Galactic X-ray binaries, supernovæ, gamma-ray bursts, stellar flares, tidal disruption flares, and as-yet unknown X-ray variables. This workshop explored the potential of strategic X-ray surveys to probe a broad range of astrophysical sources and phenomena. Here we present the highlights, with an emphasis on the science topics and mission designs that will drive future discovery in the X-ray time domain.

The first soft gamma-ray image of the Galactic Centre with arc-min accuracy

1991 ◽  
Vol 11 (8) ◽  
pp. 169-176 ◽  
Author(s):  
B. Cordier ◽  
A. Goldwurm ◽  
P. Laurent ◽  
F. Lebrun ◽  
P. Mandrou ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Galactic Centre

scholarly journals Acceleration of cosmic rays and gamma-ray emission from supernova remnant/molecular cloud associations

2015 ◽  
Vol 105 ◽  
pp. 02001 ◽  
Author(s):  
Stefano Gabici ◽  
Julian Krause ◽  
Giovanni Morlino ◽  
Lara Nava
Keyword(s):  
Cosmic Rays ◽  
Molecular Cloud ◽  
Supernova Remnant ◽  
Gamma Ray ◽  
Gamma Ray Emission
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